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HOHO · 2021年09月16日

这题A为什么不对呢？

  1. CFA I
  2. Quantitative

NO.PZ2015120604000056

问题如下：

Which of the following descriptions about leptokurtic is most approriate?

选项：

A.

A distribution of returns that has a more extremely large and small deviations from the mean is positively skewed.

B.

A distribution of returns that has more extremely large and small deviations from the mean has positive excess kurtosis.

C.

A distribution of returns that has more extremely large and small deviations from the mean has negative excess kurtosis.

解释：

B is correct

Leptokurtic refers to a distribution that is more peaked than a normal distribution with a fatter tail.(i.e. positive excess kurtosis)

这题A为什么不对呢？

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星星_品职助教 · 2021年09月17日

同学你好，

仅从“leptokurtic”这个条件无法判断是positive还是negative skewed，所以A说一定是 positively skewed的描述是错误的。

从考试角度出发，“leptokurtic”主要用来描述 kurtosis，skewness往往用mean，median和mode三者的对比去描述，或者直接描述分布的尾部情况。

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